What do we mean by a sense of hearing? Humans hear by translating sound waves, through the mechanical systems in the ear, into signals sent to the brain. The human brain learns to interpret a variety of sounds, including human speech, into something meaningful.
Jumping spiders, including Nefertiti, the Spidernaut (Phiddipus johnsoni), do not have ears. Until recently, scientists thought that jumping spiders do not hear. New research shows that the hairs on a spider’s legs translate sound into brain signals. Further, spiders can recognize the menacing sound of a wasp approaching.
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While Nefertiti was on the International Space Station, Astronaut Suni Williams said that the spider often seemed to follow her with her eyes. Perhaps part of the attention was also based on noises that Nefertiti heard.